Folder traversing does not detect symlinked files.

[TomiS]

I ran into this while using JSPM-cli that is apparently using this library, so this is more like a question/suggestion than an actual bug report. My original JSPM-related issue here:
jspm/jspm-cli#1597

Should folder traversing handle symlinked files as they were real files in that location? I think they probably should. :)